John had never revealed his body strength to Ainsel or the other Heaven Scrying Sect members, and so they had not added that to his battle style section. While there were rumors of his body strength, nothing was confirmed, and so the information was omitted.
Right as he was trapped, John realized that the formation was something that neutralized essence cultivators. His body was completely unaffected, and so he knew he could break free at any moment. His discussion afterwards was an attempt to glean more information from Number One, but he had received nothing useful from him.
"You're quite lucky I decided to hold back on that roar," John said as he looked Number One in the eyes. "Were I to use the full power of that battle art at that close a distance, your brain might have become mush."